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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3c8cae119bff75f7501a2f6cc8b4e37f5ab8e5323d3869596a895974e16c5d33' 
  AND token = '2yfKwovPYfdFqi3+xtZJtKEFuO9T5MZw7HPyR8dqxwA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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