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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '67d8044028e499b5c9bbd4c32e7b6ee07a9fa8570c49c69efe438fd81fb2ac57' 
  AND token = '03EC09JZKPN5J4zdIKCHOjQ/SJ//FKFx8pt6Gj0vFXE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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