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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6514e57552479cb5273f204a6b43b96c4fb2b1baaf690b3cef851efa41c2050b' 
  AND token = '1Km7z0SUe7IqCqg9WsCEICYKzNtpAQURjrhZ2Bs/TQ4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}