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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ad41811b4e681e83435a4831d75f43412be084f5670075d6d62a4c23efe72e16' 
  AND token = 'vYGKfJcpMK6TFqM5Eeit7Vm5X9FKjBNqwta/FPNcM3s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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