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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7d9f9df11f666ea9422f8808ba07bc6ad78788edfe4c60e04c74d7ac20bf8e66' 
  AND token = 'WAfpF5AmeDzj6xq5P3qIEhKrVaurz11IUrXuk8TO7Hk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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