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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '19fefe53d7ec694d2c906f06cf2261ae1ad8b6e2ae961667ae1c2c5cf1882cda' 
  AND token = 'yhG6y56XM3DpcD9tIF0ngM47Tow3C0YiRPlnjZQk7aI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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