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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '46b42e37a6d77ad296193a83053f54237b8aacda9b05287873bf731dcacd15ea' 
  AND token = 'YUR6+dCeXhIuU8YswDFRfakRGPDYO5snQpdjtwIQHio=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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