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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '788eaef8b52a2f23e54eef896f79cc51e9d0a2f20bf007717985088ed7960f65' 
  AND token = 'mtYqddExTbRnvFUQ+QJYIZNTuiWNpoSWvDC9/PA4XjM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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