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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '829dec9ffbec423f89a4745832f90a188821af39f71d58f2b63b824db439b3be' 
  AND token = '8aJJ2f0FCphKsK2j8DVel3Jb9QbZolYS1Sn7MFEFcYw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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