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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c89a4cf45d453574f7f928f434400566e5b2f5b4d5da632d040974dcda27a360' 
  AND token = 'lRuUEsi5oJzD0oQ2Rxb5pvKVEev+4jcNOllKKpiCODg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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