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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '40b85f72bf35bc4d171372ce7f70cca13ad7128a35e723c946e0f33a661d0a00' 
  AND token = 'H5Htotc+5eowbL+3+UpGcBPl8t4X2N5lfRct5uut7Gk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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