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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '41f18bd6c469939f7fd258521a59a129fbc30bcb553b2d46bffb53ab5ba712b2' 
  AND token = 'fbbOW7OLlhci1gg66a06SCIysY/RmdDm9PVHf/L+M68=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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