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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '97e8a5d2e231d85993fdb6fb03f87ab98e58d7652c14e5226027473453ba14c4' 
  AND token = 'cu0DCaa+pla197VVI8/tgf0dSQPQ7+l6Oj397hb33ZM=' 
  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"
    }
  }
}