SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7aa70fccab28d27d14f0790082c826b6b21791ffeef6aceeda89d251b416dd83' 
  AND token = 'w7o8gyqazbYTEs0rJsVRdzWFHJOrVPtm2LK9OTFjZ+g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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