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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b882e4aacb39f0a730c364c5752c9234afabd2a4e9ce6d4b1fe624af55e51c38' 
  AND token = 'Ea824dUm8/CVBzKlD+FFwXsZ1U777g1Mx4stgrinML0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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