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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '15a4dae636b131b3bcb0ea529464926c78eb536b39702b6eb1322e6b11069e20' 
  AND token = 'X/CtD4o3BGajkE44+Zcfy9eVfWD8VVR6ht6yQ1jwh1U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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