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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9df5cd2b3387b8302036104e515d8c7de70ae1d7f55e5b3e10c5f0f8c3c3f231' 
  AND token = 'TguvVwK09bhikbWchTO95dqZRTpDRqsTNhFalHeDuPY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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