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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dd4ed3cd1a86a10705eae7c8a510d84228fc3b7acdc7d28f3c22574c38eba39e' 
  AND token = 'IgGm+uTeRjVMFfNd6Aw3xqD2jW/mXhc/cHrgfpAD+FI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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