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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6d3479e76400b3cf9dcaa1d7443a421be69a5d8bacd33911d5950d0e1731406b' 
  AND token = 'r+IVAoZphYjiwZWGfOJIN1nK2e+akSf9jRV0EEE5mxA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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