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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '223eef0c187be03953a2698878108dc48886f556ebec603c621358fd1ae5997e' 
  AND token = 'LS68mmLiB4oz2pmzl9XN3jY15k12fjDbP1kyVwyeoKM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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