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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '39f36b444dd63b58c113ad222370f5dc2b679a32868e2a8cbd38821bf6d84cfb' 
  AND token = 'Vj5mMp974PIWUf0xreNSE1xV+grryBB7G9F1EizPDww=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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