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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '77ff454c03af8b8fd9c40215651b51eae966583f7828274b36773736e9e8a533' 
  AND token = '5JiGCsX+6WmCcEmH32FSJARUDXd8PVCmhlk4Cl8PQBo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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