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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '43c312a92a5774c3faf4778e14f73d964491a9cce9c3890bd0878757c751aee8' 
  AND token = 'XkVC17lAuQ8ARJWt9LRwzzeZj+PaJ1aOG2NdkPkBim8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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