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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9d3136d388c2f1688ed9ce6b9df757257b478d40665bdc2ad441913a80424105' 
  AND token = 'wA8eDMcQHGqNDl4G8YWQz+sd8Weu/b/ayrH9w1fp+Ks=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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