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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '225824f39b456a2bcab7b4041de6a56e8df6c2d7e56d41b2d24a49c5fef754d4' 
  AND token = 'OjvFS7R8pM8vVaKtRjYW5vuXuW/WVCuKynIHd3OygHQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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