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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '036e863282b37330541c51a6b4de6b5febc1057a72d43e503f56621cbbf49e07' 
  AND token = 'V3uMwfyWOrGRKcTqryDNT0X+lr4/3Cy3QWayBbbCyx0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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