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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2e97fa5f50e1d74d3496029a402cb6b7e9ec8ed5d93c7c0c7266af13605fd6f0' 
  AND token = 'Mun7wW7NxRHpaxzvE6CGoYsseHQFbfAjgAlR8yP70is=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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