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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0ca0427eae45a279f9fdd007642750ee87baf483327805c9f0299680d8ea9ad4' 
  AND token = 'AfRX2GmX3WhCl6x461RY5Bv6B6vV28keTUJ3Nm3L9uY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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