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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '10d3184230e6c9ea357b87f85cb7581a01edae4f6c401430e92640726402d248' 
  AND token = 'xxHmuuh/LoNK9Ra/qxWi213Fc2yY1HM/j47kr96HfJY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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