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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e1acfa70b8b1e6e993ef60da70338ad88df3de2cb24f54cc4a748cd6ff0a3650' 
  AND token = '9O6WR9nV3NB3wSHJxWJzHsG+CdXJHC+7p10P9bSh6EA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00059

JSON explain

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