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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '665ca97c711926d49bb24a78421c369357630d625cd9a7d508d2b0f483c625a2' 
  AND token = 'REEkIM9Z69SIxz0wyG4E524K+UZ7UyRQe7L/QAbTv/U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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