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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6cca8d324ef235f2e6af1ee4010023f394242162b12325c449b94de721151faa' 
  AND token = '/jFa7NEjEDlKQm32SwCtJClqqbmOh0i2bmtKtDB+EGU=' 
  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"
    }
  }
}