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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0662d4b774cc1882707a565bf25462c151f4d5cbb59aaade89ff1e2b5b6e04d9' 
  AND token = 'tfe7ZNCKG7Z6MSdNdQNdU1emn3byYR0YTZUO6VTt5OM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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