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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '514b30f242be93f427c07fc88b7b23e40f12c8fe0d1bb75010827b7f29c552fb' 
  AND token = '3iJxWgJiRD89kyo/snkQXagd24JPqyvH3DrMasXJgCU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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