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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b4e729635a7ff417189fdd4e4a9611ba6d57c12484ebb77a2bc85635930bb031' 
  AND token = 'f4MskmFBul9dsmW1i8X3P9NOI9nk8rYAXpZ2MRHMdn8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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