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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '883bcc6542165d29f0825087caa3c2b76a691a58401ef9a3e0df8e10c6dc8d0e' 
  AND token = 'tfO3vm4d2DjNMCMwKPVEmEo1vJVeCDJWD3suHs3CvYA=' 
  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"
    }
  }
}