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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4c45d1d949c7e3e9490de8d4a38f7695791a484632d5cd7d9bbcb32fe59fc8d5' 
  AND token = 'gYjJVFfldswBJxARmsqnKFWe5PG7EPk24Jk4em3GHuU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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