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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '833e3c0b7af267a809fbc8c05265787914e1173db7f8aa39e055917b9b40f76e' 
  AND token = 'flbi3m/cylZpqy9R7XaHli0i/bUtSaV27opBucoyR8o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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