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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1e4884c47796b7b6a2c4dd18b7f9d287b03209e06e205ca18195856f19aabee5' 
  AND token = 'uQiQyOjrk8YMTT/eGpCa/1aqBX6qqP6vBuntfF1j1Vk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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