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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '473a60fe5484831f46b16a8bcb202b8ab09c8f021665dabb35b852b322a8c407' 
  AND token = '1ks15cGYprEBtJXuQq3ECOGQEMKPsanG3k2+yL7CohM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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