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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '35d932f02e2c3ba0a08be92536e42d948f28f06ae87395c6899097b1e8e48cde' 
  AND token = '462SlyEjEhuNjWAccZJtXomkT6bUbnTr46ngx8YtC1w=' 
  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"
    }
  }
}