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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '72f67057faae2c42e9ab069ba539166920512c396149d64e064ba71df437a59c' 
  AND token = 'ikV0qp2S/aOSI4tUmCOPD0k70yHt+pFttvpowtB2fsg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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