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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1692b1e7b74967974a44046d10667a1832d1996bc83b76c632ccecd76f8070ab' 
  AND token = 'PgcjyTPJdj4aVObpF/tq3980hEJ+8gaXH4Y48A99k2w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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