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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '327c486175f4a32a9ad2efc627e73fd80a819c3d1b35b5a672d23501913d5e08' 
  AND token = 'QaNlOWN72HEk+ujZQeINJcJV75Af/2NC8+jDR5Ti+U0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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