SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '32b7878835f0f66bd2f580c493fa7c6a244b6b3484bb856dc85c56592ffd4045' 
  AND token = 'G7o1h+zFX1Y6Bg7u/uCZBn2PgJwBBbZ9ScA2X+k6FKc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00011

JSON explain

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