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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f27b2ef8b30e113c79f5295c5fb6bf8d951d8799226b14324719a5d93857e12d' 
  AND token = 'fAPNSaf46H08jb99vqJfCgFl9JfZ6aXmVHU/pQdpX1c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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