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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a3d19ce56906894375cf01d2e6e716f25c1fec50c75edc6ac7cf0107d57f5a40' 
  AND token = '4GMxap0iiStp46nf8SXaHOyZ5rfpuxnbNtvnClCUsiI=' 
  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"
    }
  }
}