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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5bc7afb1060f93b572800295f29b1688d3f35a8edbee0cb94359c1c82775f6c2' 
  AND token = 'Va2h/laBXyG3rVwxA4YJD4/tSleKk1CFBD5nni5koF4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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