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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '17756f6f58ff2a3bbd70c6670d15223ef6f058af2b6a1fa8aea70693bb27ffd1' 
  AND token = '5mqvHknK5dN1QxbwPj0XCcMTJJtpP4a9zmIvdXSzYu4=' 
  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"
    }
  }
}