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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0dc91af40b3e346533ff08362a8b423dc10b86306f62f44572d6dc86790ab3ff' 
  AND token = 'ChQiKYoLRuN0G+tKh7P8u7SLzni81qWKpLi3goXcVpg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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