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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b6b0092db29799cd2881353c1aa2703f3a8aaf9946d9cc73cb9cf03328e7c860' 
  AND token = '/7QxsPsohwcd/gZdkKB0l73iSxdfUg1VWosgXlDzOb0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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