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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd3715633d2a15ddaa8f0e20a36922c7085a70bd4d3528f681529f54068ec1106' 
  AND token = 'J5YFVe6KGRHzxdVQAN8/aoz81WMHISbd6PEs6e7m8v8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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