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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b9936834be99b37e1fb8549cf76de32be89b5953fed5f02b997da67549f63ced' 
  AND token = 'Jg4nhxwJzxRbHlb7YM+594A79K/XK/CaiybEVd8/9Zk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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