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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c88590d2e8c3d34476ed2d704b6dfdf3bfa83cdf1b4d5cf6387479f4c264e418' 
  AND token = 'nvVJ6jOH2ZCfuicb9Jnk5Ay3Fd40YH5H+pV7814FwvA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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