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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2ea5034f235f92b5305e03a011d8dd65d872d6a4d13a7d76aaeaeb5a5dd6d27e' 
  AND token = 'mZu4ohLSZMtLPHiokGCgap4hO6vBAHbrL/K5zIdacJU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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