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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c92d5e3f4e8ee556102900ef065f34c89e468eadf85988b7d709881131377151' 
  AND token = 'u4t1N0ef7oYoc3gtn6+7lJcZZT2im0Ca8G7HHMlxvWo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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