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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '086dbe24bf63cca6dcfb059508f3fcb39b5f6313d98c6deeea79b3ea11d35ea8' 
  AND token = '3tP5+8fKEPCaSFas+JpkkVjZMxU70bMxdiq70g+49JQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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