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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4243b3031bcb54faadbdd7c33639854c707b35e664e6e704c1494ca95158cebc' 
  AND token = 'C1/b0hqLxotuy5n0X5eUyCS2Jym73PZSqPY1d33jGA8=' 
  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"
    }
  }
}