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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '148a2156803fed9c11c17b4daa653513f5fd198e7f10746979a8a0458b367498' 
  AND token = '0axXu2bm2XaMwfQxuX/uMM34EsoeklXB6aFlkctRTrI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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