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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'edbf10f05155efa3148534b8afe7a5399933045d83e99624b6b56ec3cf70b2ce' 
  AND token = 'xVtfIkkmzMkKutuaX6HLyH0qQhK0r78IyiQD8ToeyxY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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