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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd505e8412be339c6f9c067f43cda1fa90501b0358a7635281ded58f5dd334376' 
  AND token = 'YTtEv/n0NCWKB+0ja0c6hb1ScltXwvUAQXz7pr5CaSg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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