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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cc3b43ef22e6eb902bbebc8025f127e9d9e4365a8af5f7460307cea4e91dee40' 
  AND token = '/qtsd99wjo3/itogg9y04dc0MCYycWf9LnjF6/s/MkM=' 
  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"
    }
  }
}