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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'caa24e0697b6e5d6779008e7861fdad10d26fd3ea4aa8b2b574577a391f0bb2d' 
  AND token = 'x/Sv1ziJYNnf8J62H27ORqvd4ZrLXKAv9WtRGV7tiT8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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