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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4ead5dff9e4650ea3e50e46ab0b517ae8b85b8901002f3a1eca535c9f9e35ebd' 
  AND token = 'uK0p3V6UUsDstg+eECgOdaBQr6irV4BaN5ycdyB9BJA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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