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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9f6da560065d1c0a09619f5171e6d7b8c0374bcc7bc7c1c9195b097b351e3011' 
  AND token = 'XrO1fiMhfXZvkP4hmsoZONKsBAfOLqbH42FVj41g/bA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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