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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9eec7d9605dfc589e6ccef6802351fa24a311592a4b756738c43ed45961d9b18' 
  AND token = 'SKrmMeUXx7uUYb5dzbaUMAI30+bFCIiE7G/MzmmRsng=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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