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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '17ff5a0f6d46cbd7e86c69016c48b6b450bfcb66da00592b3a0b2d2a3732ed22' 
  AND token = 'snaSVj2Q9lAtdN2S1+aV37I+RRetK0AIhgJY0yXHuoI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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